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High-level resistance to oxidative stress in Lactococcus lactis conferred by Bacillus subtilis catalase KatE

T. Rochat^1,,

A. Miyoshi^2,

J. J. Gratadoux^1,

S. Sourice^1,

P. Langella^1,

¹ Unité de Recherches Laitières et de Génétique Appliquée, Institut National de la Recherche Agronomique, Domaine de Vilvert, 78352 Jouy-en-Josas cedex, France
² Institute of Biological Sciences, Federal University of Minas Gerais (UFMG-ICB), Belo Horizonte, MG, Brazil

Correspondence
P. Langella
philippe.langella{at}jouy.inra.fr

Lactococcus lactis, a lactic acid bacterium widely used for food fermentations, is often exposed to damaging stress conditions. In particular, oxidative stress leads to DNA, protein and membrane damages that can be lethal. As L. lactis has no catalase, the impact of production of the Bacillus subtilis haem catalase KatE on its oxidative stress resistance was tested. This cytoplasmic catalase was engineered for extracellular expression in L. lactis with an optimization strategy based on fusion to the nisin-inducible promoter and a lactococcal signal peptide (SP_Usp45). The production of KatE by L. lactis conferred an 800-fold increase in survival after 1 h exposure to 4 mM hydrogen peroxide, and a 160-fold greater survival in long-term (3 days) survival of aerated cultures in a cydA mutant, which is unable to respire. The presence of KatE protected DNA from oxidative damage and limited its degradation after long-term aeration in a cydA/recA mutant, defective in DNA repair. L. lactis is thus able to produce active catalase that can provide efficient antioxidant activity.

Present address: Unité d'Ecologie et Physiologie du Système Digestif, Institut National de la Recherche Agronomique, Domaine de Vilvert, 78352 Jouy-en-Josas cedex, France.

Present address: Unité Mixte de Recherche Génétique et Horticulture, 42 rue Georges Morel, BP 60057 49071, Beaucouzé cedex, France.

These authors contributed equally to this work.

||Deceased 5 January 2000.

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